JPH0741104B2 - Tube stripping device for Bowden mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stripping device for stripping coating material for coating the surface of a Bowden mechanism tube which is formed by inserting a wire into a bendable, non-stretchable tubular core wire.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show a tube for a Bowden mechanism used for a side brake or a clutch of an automobile. The tube A is a round steel material as shown in the drawing.
a'or flat steel a'is twisted in a spiral shape to form a cylindrical core a
After forming, the surface is covered with an insulating coating b so as to be bendable and non-expandable. After cutting this tube to a specified size, it is attached to a specified location with both ends restricted so that it cannot move, and a tensile force is transmitted to a remote location with a wire (not shown) inserted through the center. At this time, since it was necessary to fix metal fittings or the like to the ends, the coating on both ends had to be peeled off by a predetermined size.

FIG. 8 shows a conventional coating stripping apparatus used for stripping the surface coating. As shown in the figure, the coating stripping device includes a cylinder device 24 for driving a pair of holding members 21 in and out of contact with each other, and a cylinder device 25 for driving a pair of clamping blades 22 in and out of close proximity to each other. One cylinder device 2 in a direction orthogonal to the devices 24, 25
5 is provided with a drive device 23, and its operation is such that the tube A is inserted between the holding bodies 21, 21 of one cylinder device 24 and between the pressing blades 22, 22 of the other cylinder device 25. Inserted into the clamping body 21 and the clamping blade 22.
After pinching the tube A with, the driving device 23 moves the one cylinder device 25 in a direction of separating from the other cylinder device 24, so that the coating in the tip direction sandwiched by the pinching blades 22 of the tube A is removed. It was pulled out from the core wire.

[0004]

In the conventional stripping of the coating described above, since the tube itself is pulled, there is a risk that the core wire wound in the form of a coil will extend, and the tube is held by the holding body during this withdrawal. Therefore, there is a problem that the surface coating may be damaged. An object of the present invention is to solve the above conventional problems.

[0005]

According to the present invention, in order to solve the above-mentioned problems of the prior art, a pair of pinching blades driven in the contacting / separating direction and a pair of pinching blades having a convex portion at the tip end contacting / separating with the pinching blade It was decided to peel the coating with a peeling device equipped with a shaft driven in the direction.

[0006]

When the pair of pinching blades are driven toward each other, the semicircular tip blades bite into the coating on the tube surface to separate the coating. Further, the shaft is inserted into the coating of the tube by positioning the tube by fitting the convex portion of the tip to the end portion of the core wire of the tube and driving in the protruding direction,
It acts so as to pull out the coating at the tip from the core wire without pulling the core wire.

[0007]

1 is a perspective view showing an embodiment of the present invention, FIG.
3 and 4 are a front view, a partially cutaway plan view,
It is a side view. As shown in the drawing, the coating stripping device for a Bowden mechanism tube according to the present invention includes a pair of first cylinder devices 2, 2 via a tool rest 7 movable toward one side of the base 1.
And the second cylinder device 3 is arranged on the other side of the base 1 in a direction orthogonal to the first cylinder devices 2, 2, and the first cylinder device 2 Clamping blades 4, 4 each having a semi-circular cutting edge are removably attached to the second cylinder device 3, and the core wire a (see FIG. 6) of the tube A to be processed is attached to the second cylinder device 3.
And a shaft 5 having substantially the same diameter as that of FIG. 7) is attached so as to be retractable. Then, on the base 1 in front of the cylinder device 3, a contact plate 6 having an insertion hole 6 ′ is erected, and the tip of the shaft 5 is projected as shown in an enlarged sectional view of FIG. The portion 5'is held slidably in a protruding state. The contact plate 6 rotatably holds the tip of the adjusting bolt 8 inserted through the tool rest 7.

Reference numeral 14 denotes a valve mechanism to which a supply device for compressed air (not shown) is connected. The valve mechanism 14 communicates with the first cylinder device 2 via air hoses 16b and 16c and the second cylinder device via the air hose 16a. Cylinder device 3
Is in communication with. Further, a relief valve 13 communicating with the valve mechanism 14 via an air hose 16d is provided on the side of one of the cylinder devices 2.
The replaceable blade base 10 for holding the pinching blade 4 driven by means is provided with a substantially L-shaped pin 12 which comes into contact with and separates from the relief valve 13 with the movement of the replaceable blade base 10 and drives the valve to open and close. Has been done.

A semi-cylindrical support 9 for holding a tube to be processed is fixed to the center of the upper part of the tool rest 7, and the insides of the spare tool rests 10, 10 facing each other are respectively contacted. The pin 11 is provided so as to project.

In the figure, reference numeral 1'denotes a support plate for rotatably holding the base end side of the adjusting bolt 8 described above, 8'is an adjusting knob of the adjusting bolt 8, and 7 ', 1 "are the above-mentioned respectively. 2 shows a mounting plate for fixing the first cylinder device 2 and the second cylinder device 3. Further, 17 and 19 are pistons of the cylinder devices 3 and 2, and 18 and 20 are the pistons 17 and 19 which are returned to the original state. A reference numeral 15 denotes a safety cover, and 15 'denotes an insertion port formed on the front surface of the safety cover 15 for inserting a tube.

4 and 5 show a tube for a Bowden mechanism whose surface coating is stripped by the coating stripping apparatus of the present invention. The tube A is a round steel material a'or a flat tube as shown in the drawing. The steel material a ″ is spirally twisted to form a cylindrical core wire a, and then the surface thereof is covered with an insulating coating b.

Next, the operation of the coating stripping apparatus of the present invention having the above-mentioned structure will be described. First, the tube A which requires processing is inserted from the insertion port 15 'of the safety cover 15, and the operation shown in FIG.
The tip is inserted into the convex portion 5 ′ of the shaft 5 protruding from the contact plate 6, as shown in FIG. Next, when an air supply device (not shown) is operated, compressed air is sent from the valve mechanism 14 into the first cylinder device 2 through the air hoses 16b and 16c, and the inserted piston 19 is attached to the spring 20. It pushes against the force and pushes out the pinching blade 4 at the tip. Eventually, the pinching blade 4 has its tip coated on the surface of the tube A b.
The contact pin 10, which bites into the coating b and faces the contact pin 10,
Stop at the position where 10 touched. At this time, as described above, the blade edge of the pinching blade 4 is formed in a semicircular shape having substantially the same diameter as the diameter of the core wire a of the tube A to be sandwiched. She will be sheared all around.

In this way, when the pinching blade 4 bites into the coating b on the surface of the tube A, the further movement of the piston 19 is restricted by the contact pin 10, so that the valve mechanism 1
By the action of 4, the compressed air sent in this time flows to the second cylinder device 3 side via the air tube 16a, and the internal piston 17 shown in FIG. 3 resists the biasing force of the spring 18 in the figure. Pushes to the left. Therefore, the shaft 5 integrally fixed to the piston 17 also moves as shown by the arrow. At this time, as described above, the pair of pinching blades 4, 4 arranged in the direction orthogonal to the shaft 5 has the tube A
Since the coating b at the tip of the tube A is held in the coating b on the surface, it is held between the pinching blade 4 and the contact plate 6,
Only the inner core material a is pushed to the left by the shaft 5.

In this way, the coating b on the tip of the tube A is
When the supply of air is switched to exhaust after the air has been extracted from the core wire a, the air pressure in the first cylinder device 2 drops, so that the inserted piston 19 is pushed back by the urging force of the spring 22, Clamping blade 4 at the tip of the piston 19
Moves in a direction away from the tube A. At this time, the pressure on the side of the second cylinder device 3 is the same as that of the valve mechanism 14 communicating with the second cylinder device 3.
Will not be reduced by the action of. Eventually, a pin 12 projecting from the side of the blade holder 10 driven by the cylinder device 2 comes into contact with a relief valve 13, and when the relief valve 13 is opened, the second pin communicating through a valve mechanism 14 The pressure of the cylinder device 3 decreases, and the inserted piston 17 returns to the original state by the urging force of the spring 18.
Therefore, the shaft 5 connected to the piston 17 is pulled inside the contact plate 6. At this time, the tip of the shaft 5 is covered by the pinching blade 4 on the tip side.
Although b is covered, since the side surface of the coating b is in contact with the contact plate 6, only the shaft 5 returns to the original state and the coating b is removed.

As described above, in the coating stripping apparatus of the present invention, the coating of the tube tip can be performed without pulling the core wire.
It is peeled off as shown in FIG. 6 or 7.
In order to change the length of the coating to be peeled off, the adjustment knob 8'may be rotated and the tool rest 7 to which the first cylinder device 2 is attached may be moved in any direction.

The tube formed as described above is
After crimping a metal fitting or the like to the end portion, the Bowden mechanism is configured to transmit tensile force to a distant place by a wire inserted through the center by being attached to predetermined places for regulating both ends.

[0017]

As described above, in the coating stripping apparatus for the Bowden mechanism tube of the present invention, at the time of stripping the coating, the shaft acts so as to push the core wire into the coating for stripping.
It is twisted in a spiral shape, and the surface coating can be peeled off without damaging the core wire with a structure that is weak against tensile force, improving processing accuracy, reducing the incidence of defective products, and eventually reducing product cost. Play.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment.

FIG. 2 is a front view of the same.

FIG. 3 is a partially cutaway plan view of the same.

FIG. 4 is a side view of the same.

FIG. 5 is an enlarged cross-sectional view of a main part of the same.

FIG. 6 is a simplified perspective view showing an example of a Bowden mechanism tube.

FIG. 7 is a simplified perspective view of another Bowden mechanism tube.

FIG. 8 is a simplified plan view of a conventional example.

[Explanation of symbols]

 1 Base 2 First Cylinder Device 3 Second Cylinder Device 4 Clamping Blade 5 Shaft 5'Convex 6 Abutment Plate 7 Turret 8 Adjusting Bolt 9 Receiving Tool 10 Replacement Blade 11 Pins per Pin 12 Pins 13 Relief Valve 14 Valve mechanism 15 Safety cover 16a, 16b, 16c, 16d Air hose 17,19 Piston 18,20 Spring

Claims (1)

[Claims] 1. A pair of pinching blades having a semicircular blade tip and arranged to face each other, a first cylinder device for driving the pinching blades in a contacting / separating direction, and a tip having substantially the same diameter as the core wire of the tube. A shaft arranged in a direction orthogonal to the pinching blade and provided with a convex portion that fits into the end of the core wire; and a second cylinder device that drives the shaft in a direction to move toward and away from the pinching blade. A coating of a tube for Bowden mechanism comprising a contact plate penetrating the tip of the shaft and erected on a base, and a valve mechanism for sequentially supplying air to the first cylinder device and the second cylinder device. Peeling device.